Adsorption of hexavalent chromium onto magnetic natural zeolite-polymer composite
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Subtitle: Adsorption of hexavalent chromium onto magnetic natural zeolite-polymer composite
Publisher: Elsevier
Publication year: 2015
Journal: Journal of the Taiwan Institute of Chemical Engineers (1876-1070)
Volume number: 50
Start page: 242
End page: 251
Number of pages: 10
ISSN: 1876-1070
URL: https://www.sciencedirect.com/science/article/pii/S1876107014004519
Languages: English-United States (EN-US)
Abstract
Magnetic natural zeolite-polypyrrole (MZ-PPy) composite was prepared for enhanced removal of hexavalent chromium [Cr(VI)] from aqueous solution. The structure and morphology of the prepared adsorbent was analyzed with the Fourier transform infrared (FTIR), field-emission microscope (FE-SEM), energy dispersive X-ray (EDX), high resolution transmission electron microscope (HR-TEM) and X-ray diffraction (XRD). The effects of magnetic zeolite loading within the composite, initial pH, sorbent dosage, temperature and Cr(VI) concentration on Cr(VI) removal efficiency were investigated. Up to 99.99% removal efficiency was obtained when the pH was 2 and the initial Cr(VI) concentration was 300 mg/L. The sorption kinetic data fitted well to the pseudo-second order model and isotherm data fitted well to the Langmuir isotherm model. The maximum adsorption capacity determined from the Langmuir isotherm increased from 344.83 to 434.78 mg/g as the temperature was increased from 25 °C to 45 °C. Thermodynamic parameters revealed that the adsorption process is spontaneous and endothermic in nature. The results further indicated that the adsorption capacity is decreased in the presence of SO42− ions. The adsorption–desorption studies indicated that MZ-PPy retained its original Cr(VI) sorption capacity up to two consecutive cycles.
Keywords
Natural zeolitePolypyrroleChromium (VI)Adsorption
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